docs: def get_bulk(self, create=False):
          """Return bulk code"""
          result = []
          op_type = "index"
          if create:
              op_type = "create"
          meta = self._meta
          cmd = {op_type: {"_index": meta.index, "_type": meta.type}}
          if meta.parent:
              cmd[op_type]['_parent'] = meta.parent
          if meta.version:
              cmd[op_type]['_version'] = meta.version
          if meta.id:
              cmd[op_type]['_id'] = meta.id
          result.append(json.dumps(cmd, cls=self._meta.connection.encoder))
          result.append("\n")
          result.append(json.dumps(self, cls=self._meta.connection.encoder))
          result.append("\n")
          return ''.join(result)